460 
Journal of Agricultural Research 
Vol. I, No. 6 
Norway pine (Pinus resinosa ), which is regarded as a hard or pitch pine, 
offers an exception to this. Here we find numerous tyloses, but here 
also we have large ray pits. The only soft pine examined which did not 
contain tyloses was pinon pine (Pinus edulis ). This species is character¬ 
ized by small ray pits instead of the large ones common to this group. 
Of the other conifers all of the species listed below have small ray pits. 
No true tyloses were found in these species. (See Table III.) 
Table; III. —Occurrence of true tyloses in native conifers . 
Soft Pines. 
Species. 
Number 
of speci¬ 
mens. 
Sap wood. 
Heart wood. 
Limber pine (Pinus flexilis) . 
I 
Abundant.. 
Sugar pine (Pinus lambertiana ). 
I 
...do. 
Niimermts. 
Western white pine (Pinus monticola) . 
I 
...do. 
Do. 
White pine (Pinus strobus) . 
2 
Numerous.. 
Do. 
Pifion pine (Pinus edulis) . 
I 
None. 
None. 
Hard Pines. 
Norway pine (Pinus resinosa) . 
Jack pine (Pinus divaricata) . 
Shortleaf pine (Pinus echinata) . 
Spruce pine (Pinus glabra) . 
Lodgepole pine (Pinus murrayana ).... 
Longleaf pine (Pinus palustris) . 
Western yellow pine (Pinus ponderosa) 
Pitch pine (Pinus rigida) . 
Loblolly pine (Pinus taeda) . 
Scrub pine (Pinus virginiana) . 
Table-mountain pine (Pinus pungens). 
2 
Numerous.. 
Numerous, 
1 
None. 
None. 
3 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
2 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
Other Conifers. 
Tamarack (Larix laricina) . 
Western larch (Larix occidentalis) . 
European larch (Larix larix) . 
White spruce (Picea canadensis) . 
Engelmann spruce (Picea engelmanni) . 
Black spruce (Picea mariana) . 
Red spruce (Picea rubens) . 
Sitka spruce (Picea sitckensis) .. 
Douglas fir (Pseudotsuga taxifolia) . 
Balsam fir (Abies balsamea) . 
White fir (Abies concolor) . 
Lowland fir (Abies grandis) . 
Alpine fir (Abies lasiocarpa) . 
Red fir (Abies magnifica) . 
Noble fir (Abies nobilis) . 
Port Orford cedar (Chamaecyparis lawsonia) 
Yellow cedar (Chamaecypdris nootkatensis )., 
California juniper (Juniperus californica) .. 
1 
None. 
None. 
1 
...do. 
Do. 
1 
...do. 
Do. 
2 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
2 
...do. 
Do. 
2 
...do. 
Do. 
2 
...do. 
Do. 
2 
...do. 
Do. 
1 
...do. 
Do. 
2 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do....... 
Do. 
2 
...do. 
Do. 
2 
...do. 
Do. 
1 
...do. 
Do. 
1 
...do. 
Do. 
